Whenever you travel to a foreign country you need to have certain precautions, especially if you do not speak the language fluently and you are not familiar with city. This is even true if you are visiting Istanbul. Here are a few travel tips in case you are going to Istanbul in the near future.
If you do not speak Turkish, try to get yourself a dictionary or a phrase book. Not many people speak English here so you are going to want to learn a few phrases for politeness and in case of danger. You should learn the basics: hello, how are you, goodbye, stop, help and anything else you find useful.
Unfortunately, there are quite a few scams that occur in Istanbul. The major caution areas for scams are in well known hotels, taxis, bars and places that handle money such as marketplaces. In well known hotels, such that are in a guidebook, are aware of their popularity and service so they often try to hike up their prices. Try to avoid these places that are found in guide books or go with a local so they can help you out.